Filterless narrowband photodetectors employing perovskite/polymer synergetic layers with tunable spectral response

Abstract

Abstract Spectrally selective light detection, especially the detection within desired spectral range, is crucial for many fields, such as image sensing, optical communication, climate monitoring and national defense. Conventional narrowband photodetectors with optical filters are face to the architectural complexity and the increased device cost. Here, a smart strategy for achieving the narrowband light detection with photodetectors is proposed by employing perovskite/polymer synergetic layers, in which the perovskite layer acts as an electronically-quenching optically-active (EQOA) layer and the polymer layer acts as the active layer. The full width at half maximum of this narrowband photodetectors can reach minimum 50 nm due to the sharp absorption edges of perovskite materials, and the optimized photodetectors exhibit suppressed dark current of 1.85 × 10 − 5 mA cm − 2 , high specific detectivity of 1.37 × 10 12 Jones (cm Hz1/2 W−1). Furthermore, the spectral response can be tuned via managing the bandgap of the perovskite material, and a series of narrowband photodetectors with response spectral range between 680 nm and 710 nm were fabricated. This provides a new design paradigm for a narrowband photodetector with many imaging applications.